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Full Discussion: File read/ write operation
Operating Systems Linux File read/ write operation Post 302426768 by Corona688 on Wednesday 2nd of June 2010 10:58:03 PM
Old 06-02-2010
I have written AJAX-driven systems callign linux scripts, yes.
Quote:
Originally Posted by xs2punit
As ajax at the client could ONLY read the file, there is no point of locking.
We've told you over and over what the locking's for and why you need it for reading a file that something else is appending to.
Quote:
Well regarding "file release" thing: I mean that the data is not available while it is getting updates, so it seems that the file is being held until whole process is completed.
Again, linux doesn't hold the file. Locking of that sort is opt-in and you're not opting. The behavior you describe seems more and more strange...

By file do you mean a real, genuine, unparsed, honest-to-god file? Or do you actually mean your AJAX is reading output fetched from a server-side script? They act very differently, and the latter would act like what you're saying, and wouldn't need locking like you're saying. The web browser would just wait for its output. If you're reading script output, and it's arriving all at once, it's probably line-buffering. Flush the output on the server side whenever you really want the script to send. Or, just write a newline, which should flush it too.

Last edited by Corona688; 06-03-2010 at 12:04 AM..
 

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Mail::SpamAssassin::Util::Progress(3pm) 		User Contributed Perl Documentation		   Mail::SpamAssassin::Util::Progress(3pm)

NAME
Mail::SpamAssassin::Util::Progress - Progress bar support for SpamAssassin SYNOPSIS
my $progress = Mail::SpamAssassin::Util::Progress->new({total => 100}); $msgcount = 0; foreach my $message (@messages) { # do something here $msgcount++; $progress->update($msgcount); } $progress->final(); DESCRIPTION
This module implements a progress bar for use in SpamAssassin scripts and modules. It allows you to create the progress bar, update it and print out the final results of a particular run. new public class (Mail::SpamAssassin::Util::Progress) new (\% $args) Description: Creates a new Mail::SpamAssassin::Util::Progress object, valid values for the $args hashref are: total (required) The total number of messages expected to be processed. This item is required. fh [optional] An optional filehandle may be passed in, otherwise STDERR will be used by default. term [optional] The module will attempt to determine if a valid terminal exists on the STDIN filehandle. This item allows you to override that value. init_bar public instance () init_bar() Description: This method creates the initial progress bar and is called automatically from new. In addition you can call init_bar on an existing object to reset the bar to it's original state. update public instance () update ([Integer $num_done]) Description: This method is what gets called to update the progress bar. You may optionally pass in an integer value that indicates how many messages have been processed. If you do not pass anything in then the num_done value will be incremented by one. final public instance () final ([Integer $num_done]) Description: This method should be called once all processing has finished. It will print out the final msgs per sec calculation and the total time taken. You can optionally pass in a num_done value, otherwise it will use the value calculated from the last call to update. perl v5.14.2 2011-06-06 Mail::SpamAssassin::Util::Progress(3pm)
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